JPH021288B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION An object of the present invention is to enable two types of display, negative and positive, by changing the structure of the electrodes of a liquid crystal panel.

Conventional liquid crystal panels can be made into negative display liquid crystal panels or positive display liquid crystal panels by selecting the type of liquid crystal, and one panel can only have one display format. In this method, transparent electrodes are provided only in the area to be displayed, and a driving signal is applied to the electrodes to display brightness and darkness. There was only meaning.

A method for manufacturing a liquid crystal display device of the present invention is a method for manufacturing a liquid crystal display device in which a liquid crystal is sandwiched between a pair of substrates having electrodes on opposing inner surfaces, the method comprising: a) on the entire surface of one substrate facing the liquid crystal; a step of forming a first transparent electrode; b) a step of etching the first transparent electrode to form a display pattern and a wiring pattern having a thinner layer thickness than the display pattern; c) the display pattern and the wiring pattern. d) exposing the surface of the display pattern and planarizing the surface of the display pattern and the surface of the insulating layer so that they are on the same plane; e. ) forming a second transparent electrode on the flattened surface; and f) etching away a portion of the second transparent electrode on the display pattern.

A simple display panel will be taken as an example to explain the structure of the panel according to the invention.

FIG. 1a shows a cross-sectional view of the liquid crystal and the panel, and FIG. 1b shows the top panel as seen from inside. Reference numerals 1 and 7 in FIG. 1A are glass substrates of the panel, and 2 is a transparent electrode in the display area connected to wiring on the glass substrate. 3 is a transparent insulator for separating the two electrodes, and 4 is an electrode around the display section. 5 is the liquid crystal, and 6 is the electrode on the bottom panel that covers the entire panel. Reference numeral 8 indicates the extraction portion of these three electrodes. FIG. 1b is a view of the top panel from inside. Reference numeral 9 indicates a display electrode, and only the display portion is shown. 10 is a peripheral electrode, 11 is a glass substrate,
12 and 13 are takeout terminals. Note that, depending on the type of liquid crystal panel, a polarizing plate, a reflecting plate, etc. may be used, but these are omitted and the structure of the electrodes for driving the liquid crystal is mainly shown.

As this liquid crystal panel is normally used,
A potential difference is applied between the upper and lower electrodes, and the electric field aligns the liquid crystal to display images. For example, consider a liquid crystal panel that becomes transparent when there is no potential difference between the upper and lower electrodes, and becomes opaque when a potential difference is applied. First, when electrodes 2 and 4 on the upper panel and electrode 6 on the lower panel are set to the same potential, the entire panel becomes transparent. Next, when electrodes 2 and 4 on the upper panel are set to the same potential and a potential difference is applied between electrodes 6 and 6 on the lower panel, the entire panel becomes opaque. At this time, the gap between the two electrodes on the upper panel is made opaque by the electrode on the glass substrate of electrode 2, as shown in FIG. 1a. Next, a potential difference is applied between the electrode 2 on the upper panel and the electrode 6 on the lower panel, and the same potential as 6 is applied to the electrode 4 on the upper panel. At this time, the part 9 in FIG. 1b becomes opaque, and the surrounding part 10 becomes transparent. Finally, by applying a potential difference between electrode 4 on the upper panel and electrode 6 on the lower panel, and making electrode 2 on the upper panel the same potential as electrode 6, the area 10 in Figure 1b becomes opaque, and the area 9 Parts will be transparent.

In this way, the liquid crystal panel according to the present invention has four types of display functions, and other display formats can be selected by combining the potentials between each electrode. It is possible to convert between positive and negative display.

An example of the manufacturing process of the upper panel of the present invention is shown in FIGS. 2a to 2f. A transparent electrode 15 is placed on the glass substrate 14 in a.
, and then selectively etching it, leaving a thin part for the wiring, resulting in the result shown in b. A transparent insulator 16 is attached to this as shown in c, and d is polished.
Flatten it like this. Furthermore, by attaching a thin transparent electrode 17 as shown in e and partially etching it, an upper panel having a structure as shown in f is obtained.

As an example of actual application, FIG. 3 shows the structure of a liquid crystal panel for displaying numbers. This is a so-called static drive type, and FIG. 3 shows the structure of the upper panel, while the lower panel uses a common electrode that covers the entire structure. 3. FIG. 18 shows a glass substrate, 19 an electrode around the display section, 20 an electrode of the display section, which is taken out to the outside through a wiring 21 in the lower layer. Reference numeral 22 denotes a terminal for taking out the electrodes in the peripheral area, and 23 denotes a taking out terminal for the electrodes in the display section. The transparent electrode wired in the lower layer is also formed under the peripheral electrode and the electrode of the display area, as in the example of FIG. 1, and is therefore somewhat larger than the display area. The structure of this panel is somewhat different from that of FIG. 1b, and it is necessary to insulate the wiring from each display section, which can be achieved by further selective etching in FIG. 2b. In the case of dynamic driving, the electrodes on the lower panel can also be made to have a two-layer structure.

As described above, according to the present invention, two layers of electrodes can be formed on one substrate with an insulating layer interposed therebetween, making it possible to convert between positive display and negative display. In particular, since the first electrode and the second electrode can be formed on the same plane, the thickness of the liquid crystal layer sandwiched between the pair of substrates is also the same. Therefore, it is possible to realize a uniform display with a uniform liquid crystal alignment state in both positive display and negative display, and a liquid crystal display device with high contrast can be provided.

[Brief explanation of drawings]

FIG. 1a is a sectional view showing the structure of a liquid crystal panel according to the present invention, and FIG. 1b is a plan view of the upper panel.
FIGS. 2a to 2f show an example of the manufacturing process, and FIG. 3 shows the structure of a panel as an applied example.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a liquid crystal display device in which a liquid crystal is sandwiched between a pair of substrates having electrodes on opposing inner surfaces, comprising: a) a first transparent layer on the entire surface of one substrate facing the liquid crystal; a step of forming an electrode; b) a step of etching the first transparent electrode to form a display pattern and a wiring pattern having a thinner layer thickness than the display pattern; and c) a step of forming the display pattern and the wiring pattern. a step of forming an insulating layer on the substrate; d) exposing the display pattern surface and planarizing the display pattern surface and the insulating layer surface so that they are on the same plane; and e) the planarization. f) forming a second transparent electrode on the surface of the liquid crystal display, and f) etching away the area around the display pattern on the second transparent electrode. .